archive-zip: mark text files in archives
Set the text flag for ZIP archive entries that look like text files so that unzip -a can be used to perform end-of-line conversions. Info-ZIP zip does the same. Detect binary files the same way as git diff and git grep do, namely by checking for the attribute "diff" and its negation "-diff", and if none is found by falling back to checking for the presence of NUL bytes in the first few bytes of the file contents. 7-Zip, Windows' built-in ZIP functionality and Info-ZIP unzip without the switch -a are not affected by the change and still extract text files without doing any end-of-line conversions. NB: The actual end-of-line style used in the archive entries doesn't matter to unzip -a, as it converts any CR, CRLF and LF to the line end characters appropriate for the platform it is running on. Suggested-by: NUlrike Fischer <luatex@nililand.de> Signed-off-by: NRene Scharfe <l.s.r@web.de> Signed-off-by: NJunio C Hamano <gitster@pobox.com>
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